Electroweak structure of composite hadronic systems
by
Prof.T. Frederico(Instituto Tecnologico de Aeronautica (Brasil))
→
Asia/Shanghai
Description
I will review the electroweak structure of relativistic composite systems defined on a specified space-time hyper-surface. Also, recent efforts on studying non-relativistic electroweak structure in the nuclear physics context will be briefly summarized. Under the condition of a projection on a given space-time hyper-surface the current of a composite system starting from field theory acquires contributions from two-body terms, and beyond, by implementing the constraint of current conservation. This is the case, even beginning with the simplest field theoretical one-body current model. Attention will be given to the light-front hyper-surface and the role of different frames in implementing the constraints of covariance and current conservation. The relation with the projection of the Bethe-Salpeter equation onto the light-front hyper-surface will be discussed, viewing it as a practical tool to guide the implementation of covariance in the description of few-body systems. The underlying principles will be exemplified by discussing the electromagnetic structure, starting with quark-composite systems as the pion and nucleon.
Emphasis will be given on what we can learn from the new experiments on the nucleon elastic electromagnetic form factors with respect to applications to the relativistic structure of nuclear systems, as for example the deuteron.